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Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3 Oy

Cornell Affiliated Author(s)

Author

Gael Grissonnanche
Francis Laliberté
S. Dufour-Beauséjour
M. Matusiak
S. Badoux
F. Tafti
B. Michon
A. Riopel
Olivier Cyr-Choinière
J.C. Baglo
B. Ramshaw
R. Liang
D. Bonn
W. Hardy
S. Krämer
D. LeBoeuf
D. Graf
N. Doiron-Leyraud
Louis Taillefer

Abstract

The electrical and thermal Hall conductivities of the cuprate superconductor YBa2Cu3Oy, σxy and κxy, were measured in a magnetic field up to 35 T, at a hole concentration (doping) p=0.11. In the T=0 limit, we find that the Wiedemann-Franz law, κxy/T=(π2/3)(kB/e)2σxy, is satisfied for fields immediately above the vortex-melting field Hvs. This rules out the existence of a vortex liquid at T=0 and it puts a clear constraint on the nature of the normal state in underdoped cuprates, in a region of the doping phase diagram where charge-density-wave order is known to exist. As the temperature is raised, the Lorenz ratio, Lxy=κxy/(σxyT), decreases rapidly, indicating that strong small-q scattering processes are involved. © 2016 American Physical Society.

Date Published

Journal

Physical Review B

Volume

93

Issue

6

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959562403&doi=10.1103%2fPhysRevB.93.064513&partnerID=40&md5=b35d6c884fedb0a724dadf4c2ed9b411

DOI

10.1103/PhysRevB.93.064513

Group (Lab)

Brad Ramshaw Group

Funding Source

1157490
DMR-1157490
ANR-10-LABX-0039-PALM

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